Expansible pulley or the like



April 26,1927. 1,626,240

W. A. KOSKEN EXPANSIBLE PULLEY OR THE LIKE Original Filgd March 3 1917 3 Sheets-Sheet 2 INVEIYTOR. M244 5 mum. mew

WITNESSES:

1,626,240 p 1927' w. A, KOSKEN EXPANSIBLB PULLEY OR THE LIKE Original Filed March 1917 3 eets-She et 3 IN VEN TOR. WITNESSES:

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I-"atented- Apr. 26,1927.

UNITED- STATES 1,626,240 PATENT OFFICE.

WILHO a xosxmr, or BOSTON, MassAcnnsErrs, Assronon To s'rnannrrn horror rrc'runn mcnmr. coaroaarron, or NEW YORK, 1v. 2., A coarorwrron or m YORK.

EXPANSIBLE PULLEY OR THE LIKE.

Application filed March 80, 1917, Serial No. 582,822. Renewed August 18, 1928.

My invention relates to expansible pulleys or the like and has for its primary ob ect to provide im roved means for adjusting the size of a wheel or pulley of this char-ac- 6 ter while-it is moving continuously. One of --the objects of the present invention is to providesuitable means for making accurate speed changes of extreme d elicacy in a moving; picture film while .it is running. By the use of my invention which greatly improves the operation 'ofa continuously movmg film, it becomes possible to, eliminate the perforations on the edges of the film.- These perforations have heretofore been consid- F ered necessary for impartmg the usual mtermittent movementto .a film and roperly spacing the ictures on, o elimlnate the jet y movementsmesultmg from a 3 non-uniform spacing;; o

my invention," such non-uniformity being caused by warping, contraction ;or an elontion 'ofthe film after it has :been' per- ?dratd -hnd chemically ,"treated. The everchanging. conditions in atmosphere and temperature "require corresponding changes in the movements of the-film. According to the presentfinvention, suitable means are provided. for overcoming all. of the above- EQ mentioned difiiculties and by means of this in my copendmglv ap 'li'cat'ion Serial No..-

281,761 filed Marc 10t ,1919, In the drawings? 4.

Figure 1 is-a comb'ned side elevation and section of film driving mechanism provided with my improvements, the upper portion.

of the figure? being a section on the line A-A, Figure 2; Figure 2 is a section on the line BB of Fi 1.

" igure 3 is a transverse section on the line C- -C', of figure 4, showing a modified construction ofithe film drivmg wheel.

Figure 4 is anaxial section of the same 5 on the line D-D offigure 3, parts being shown in elevation; According to the embodiment of my mvention shown in Figures 1 and 2, mechanism for carrying reflectors at a predeter- .by turnin 11101111911 of the pin 10 inthe stationary frame 6 WhlCll action will cause radial motion of f the: film 'feeding. j Iperfor'ations.constitutes another object of mined speed, is driven directly or indirectly by a shaft 1 to which is secured a pinion 2 which meshes with a gear 3 fastened to av riveted. Springs 9 are intended to act toward the axis being reactionary to centrifugal force". The inner ends of these spokes sl de on thetapered portion of the pm 10 Flg. 2. Said pin can'be actuated lengthwise a knob 11 Fig. 2 and the threaded the spokes b' the tapered portion of the pin 10 and so s ightly decrease or increase the diameter of the wheel.

On Figs. 1 and 2 is shown a roller 12 which by means of adjustable springs 13 impose the necessary pressure and friction upon the film 14. a .In-Fig. 3 and Fig/1 isshown a modifie construction of my invention in which I.

intend to use. anendless elastic band 15 on the; rim. This construction eliminates springs, makes a very compact construction and gives a smooth surface with maximum tractive effect. 1

I claim 1. The combination with a suitable support of a wheel'or pulley journalled for rotation in said support, said wheel or pulley comprising radiall movable-parts, and an adjustinghspindle ,men't wit aving threaded enga ethe support topermit longitu inal adjustment o the spindle, said spindle including atapered rim adjusting-portion adapted to be normally stationary. and having slidable engagement with sald'radially movable parts. whichcircumferentially traverse'the periphery of the tapered portion duinlg rotation of thewheel.

a moving picture machine, a rigid frame, a wheel or pulley journalled in said ri id frame,'and com risin radially movalie parts, and a sha or ar threaded in said rigid frame for axial adjustment, said shaft or bar including a tapered ortion in slidable engagement with said radially movable parts, said wheel or pulley having a hollow shaft t rou h which said bar or shaft extends, an sai frame being provided with spaced bearings for said hollow shaft and with extension bearings for said adjusting bar or shaft.

3. The combination with a suitable support of a wheel or pulley journaled for rotation thereon and having radially adjacent rim sections, inwardly extending projections associated with each rim section, a conicalportion coaxial with the wheel and engaged by said projections, said conical portion being normally stationary while the wheel revolves, whereby'the projections are adapted to traverse the conical portions circumferentially, and means for shifting the conical portion axially to present difierent portionsof the periphery thereof to the traveling proj ections for the purpose of varying the .diameter of the wheel. i

4. The combination with a suitable support of a wheel or pulley journaledfo'r rotation thereon and having radially adjacent rim sections, inwardly extending projections associated with each rim section, a conical portion coaxial with the wheel and engaged by said projections, said conical portion being normally stationary while the wheel revolves, whereby the projections are adapted to traverse the conical portion circumferentially, and means for shifting the conical portion axiallyto present difierent portions of the periphery thereof to the traveling projections for the purpose of varying the diameter of the wheel, and a continuous annular elastic band embracing the circumference of the wheel to maintain the projections in contact with the conical portion.

5. The combination with a suitable support of a wheel or pulley journalled for r0- tation thereon and having radially adjacent rim sections, inwardly extending projections associated with each rim section, a conical portion coaxial with the wheel and engaged by said projections, said conicalportion being normally stationary while the wheel revolves, whereby the projections are adapted to traverse the conical portions circumferentially, a threaded portion associated with the conical portion and having threaded engagement with the support to effect longitudinal adjustment of the conical portion and present different parts of the periphery thereof to the traveling projections for the purpose of varying the diameter of the wheel.

6. The combination with a suitable support of a wheel or pulley having radially adjacent rim sections, bearing means for journalling the wheel forrotation on the support, and means for radially adjusting said rim sections, said adjusting means being independent of the bearing means, whereby the ournalling of the wheel is accomplished independently of the rim adjustment means thereof to keep the adjusting means free from the rotation of thewheel.

7. The combination with a supporting frame, of a wheel or pulley journalled thereon and embodying a plurality of adjacent rim sections, an adjusting spindle having threaded engagement with the frame and provided with a tapered portion, means associated with the ad acent rim sections and bearing against the tapered portion of the spindle, and means for manually rotating the spindle to longitudinally shift its tapered portion for the purpose of varying thediameter of the wheel, said tapered portion being stationary except during such adjustment.

8. The combination with ,a supporting wiLHo A. KOSKEN. 

